add refresh button to pending page

lib/components/pages/traction/traction_page.dart

@@ -4,6 +4,7 @@ enum _TractionMoreAction {
   classStats,
   classLeaderboard,
   adminPending,
+  adminPendingChanges,
 }
 
 class TractionPage extends StatefulWidget {
@@ -708,6 +709,19 @@ class _TractionPageState extends State<TractionPage> {
                     );
                   }
                   break;
+                case _TractionMoreAction.adminPendingChanges:
+                  final messenger = ScaffoldMessenger.of(context);
+                  try {
+                    await context.push('/traction/changes');
+                  } catch (_) {
+                    if (!mounted) return;
+                    messenger.showSnackBar(
+                      const SnackBar(
+                        content: Text('Unable to open pending changes'),
+                      ),
+                    );
+                  }
+                  break;
               }
             },
             itemBuilder: (context) {
@@ -765,6 +779,12 @@ class _TractionPageState extends State<TractionPage> {
                     ),
                   ),
                 );
+                items.add(
+                  const PopupMenuItem(
+                    value: _TractionMoreAction.adminPendingChanges,
+                    child: Text('Pending changes'),
+                  ),
+                );
               }
               return items;
             },